How to write a rsa algorithm using thread

Hi... This my **rsa algorithm sequential code..can u anyone plz change/convert to concurrent java or parallel this code..

print("code sample");

import java.security.KeyPairGenerator;

import java.security.KeyPair;

import java.security.PublicKey;

import java.security.PrivateKey;

import javax.crypto.Cipher;

public class rsa {

private static byte[] encrypt(byte[] inpBytes, PublicKey key,

  String xform) throws Exception {

Cipher cipher = Cipher.getInstance(xform);

cipher.init(Cipher.ENCRYPT_MODE, key);

return cipher.doFinal(inpBytes);

}

private static byte[] decrypt(byte[] inpBytes, PrivateKey key,

  String xform) throws Exception{

Cipher cipher = Cipher.getInstance(xform);

cipher.init(Cipher.DECRYPT_MODE, key);

return cipher.doFinal(inpBytes);

}

public static void main(String[] unused) throws Exception {

long starttime =System.currentTimeMillis();

String xform = "RSA/NONE/PKCS1PADDING";

// Generate a key-pair

KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");

kpg.initialize(1024); // 1024 is the keysize.

KeyPair kp = kpg.generateKeyPair();

PublicKey pubk = kp.getPublic();

PrivateKey prvk = kp.getPrivate();



byte[] dataBytes =

    "J2EE Security for Servlets, EJBs and Web Services".getBytes();



byte[] encBytes = encrypt(dataBytes, pubk, xform);
System.out.println(encBytes);

byte[] decBytes = decrypt(encBytes, prvk, xform);
System.out.println(decBytes);

String res=new String(decBytes);

boolean expected = java.util.Arrays.equals(dataBytes, decBytes);

System.out.println("Test " + (expected ? "SUCCEEDED!" : "FAILED!"));
System.out.println(res);
long endtime=System.currentTimeMillis();

System.out.println("Time required for sequential rsa algorithm:"+(endtime-starttime)+"millisecond");

}

}

THANKS

LAVANYA